llvm/polly/lib/External/isl/test_inputs/codegen/unroll7.in

# Check that some code is generated.
# Older versions of isl would abort on unknown divs.
{ S[i,j] -> [i,j]: exists (alpha, beta: j=i+4alpha +3beta and 0 <= alpha < 24 and 0 <= beta and 0 <= i,j < 5) }
{ : }
{ [i,j] -> unroll[x] }